What does HRESULT 0x801F0013 (ERROR_FLT_FILTER_NOT_FOUND) mean?

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No registered minifilter matches the name passed to the Filter Manager lookup.

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ERROR_FLT_INSTANCE_NAME_COLLISION	ERROR_FLT_VOLUME_NOT_FOUND

ERROR_FLT_FILTER_NOT_FOUND

The lookup target is a registered filter, not a filesystem file

ERROR_FLT_FILTER_NOT_FOUND is returned by FltGetFilterFromName when no registered minifilter driver matches the supplied name. The comparison is case-insensitive, and a successful lookup produces an opaque filter object with a rundown reference. This status is therefore about Filter Manager registration state, not about a missing driver file on disk.

Common causes include querying before the target driver has registered, using a service or display name that differs from the minifilter registration name, or looking up a filter while it is being unloaded. The last case can instead surface a deleting-object status, so lifecycle timing matters.

What to check

Use fltmc filters to identify the name that Filter Manager currently exposes, then compare it with the exact name passed to FltGetFilterFromName.
Confirm that the target is a minifilter that completed FltRegisterFilter, not merely a service whose binary exists or a legacy filesystem filter.
Coordinate startup order if one minifilter depends on another. A retry is meaningful only after the required filter has registered.
After a successful lookup, balance the acquired rundown reference with FltObjectDereference; holding it can delay teardown.

References

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